How to get specifying key's value array?

Question

I'm trying to get array of just specifying key's value in following array obj.

Ex1) If specifying key "name",
    wanted result is : {"James", "Jhone", "Michael", "Donald", "Mac"}

Ex2) If specifying key "age",
    wanted result is : {25,27,35,25,26}

How to get?

Please help or advise.

NSArray *array = [[[NSArray alloc] initWithObjects:
        @{@"name" : @"James", @"age" : @25},
                @{@"name" : @"Jhone", @"age" : @27},
                @{@"name" : @"Michael", @"age" : @35},
                @{@"name" : @"Donald", @"age" : @25},
                @{@"name" : @"Mac", @"age" : @26},
                nil] autorelease];

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"???  == name"];
NSArray *filtered = [array filteredArrayUsingPredicate:predicate];
NSLog(@"result : %@", filtered);

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"???  == age"];
NSArray *filtered = [array filteredArrayUsingPredicate:predicate];
NSLog(@"result : %@", filtered);

stackoverflow.com/questions/5569632/…

Paresh Navadiya
– Paresh Navadiya

2012-09-14 11:16:03 +00:00
Commented Sep 14, 2012 at 11:16 — Paresh Navadiya
– Paresh Navadiya, Commented Sep 14, 2012 at 11:16

Carl Veazey · Accepted Answer · 2012-09-14 11:11:26Z

11

Give this a try:

[array valueForKey:specifyingKey]

Hope this helps!

answered Sep 14, 2012 at 11:11

Carl Veazey

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2 Comments

Analog File Over a year ago

damn. I should have refreshed before hitting Post Your Answer. +1 to you for speed.

Pankaj Wadhwa Over a year ago

what if I want to have array with more than one keys?

Analog File · Accepted Answer · 2012-09-14 11:30:15Z

2

Just use KVC.

[array valueForKey:@"age"]

should give you an array of the ages.

edited Sep 14, 2012 at 11:30

answered Sep 14, 2012 at 11:14

Analog File

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2 Comments

S.J. Lim Over a year ago

Umm.. I think there is no getValueForKey method. :D

Analog File Over a year ago

lol. this is what happens when I reply to ObjectiveC stuff while I'm reading technical papers about other languages. Corrected.

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